One aspect of the invention is a method for identifying at least one property of data. In order to fix the lower movable contact without using a dedicated pressing member, and enhance cost reduction and production efficiency, a leg portion is elongated from an outer peripheral edge portion of the lower movable contact, and the leg portion has a pressed portion in which a tip end is upward bent to protrude toward an upper face of the upper movable contact. Generally, high precision is required when mounting the separating mechanism into the paper supply cassette, and the separating mechanism must be demonstrated to have sufficient separating performance prior to shipping the product. View-point data is generated for each of users.